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However, due to the potency of prescription-grade ingredients like Tretinoin and NAD+, it may not be suitable for: People with rosacea or active eczema/psoriasis flares Those with extremely sensitive or compromised skin barriers Anyone who is pregnant or breastfeeding Individuals allergic to retinoids, copper peptides, or any formula component If you're unsure, we recommend consulting with your provider before beginning use

Here is a breakdown for the two most common vial sizes

[Google Scholar] 21.Kimura Y, Yamada A, Takabayashi Y, Tsubota T, Kasuga H

Avoid combining with compounds that have overlapping mechanisms unless specifically guided by a medical professional